Real Algebraic and Analytic Geometry

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90. Digen Zhang:
An elementary proof that the length of X14+X24+X34+X44 is 4.

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Submission: 2004, February 13.

Abstract:
An elementary proof is given, to show that the quartic form X14+X24+X34+X44 cannot be written as a sum of three squares of real quadratic forms.

Full text, 4p.: dvi 18k, ps.gz 77k, pdf 96k.


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